Sterling GF-250, TF-400, TF-150, TF-300, TF-200, TF-350, TF-175, TF-250, TF-125 Electrical Connections

ELECTRICAL CONNECTIONS

HAZARDOUS VOLTAGE! DISCONNECT ALL ELECTRIC POWER INCLUDING REMOTE DISCONNECTS BEFORE SERVICING. Failure to disconnect power before servicing can cause severe personal injury or death.

Figure 5a -

Low-voltage T

Thermostat Wiring

Single Stage

Figure 5b -

Low-voltage

Thermostat Wiring

Two Stage

Standard units are shipped for use on 115 volt, 60 hertz, single phase electric power. The motor name-plate and electrical rating of the transformer should be checked before energizing the unit heater electrical system. All external wiring must conform to the latest edition of ANSI/NFPA No. 70, United States National Electrical Code, and applicable local codes; in Canada, to the Canadian Electrical Code, Part 1, CSA Standard C22.1.

Figure 5c - T834H-1009 or T834H-1017 Thermostat Wiring

Honeywell
T834H-1009
	or
T834H-1017
Thermostat
W	R
	R	G W1 W2
	G
		D6922B

Do not use any tools (i.e. screwdriver, pliers, etc.) across terminals to check for power. Use a voltmeter.

It is recommended that the electrical power supply to each unit heater be provided by a separate, fused, and permanently live electrical circuit. A disconnect switch of suitable electrical rating should be located as close to the gas valve and controls as possible. Each unit heater must be electrically grounded in accordance with the latest edition of the United States National Electrical Code, ANSI/NFPA No. 70, or CSA Standard C22.1. Refer to Figures 5a, 5b, 5c, 5d and 5e.

THERMOSTAT WIRING AND LOCATION:

NOTICE: The thermostat must be mounted on a vertical, vibration-free surface, free from air currents, and in accordance with the furnished instructions.

Mount the thermostat approximately 5 feet (1.5m) above the floor, in an area where it will be exposed to a free circulation of average temperature air. Always refer to the thermostat instructions, as well as our unit wiring diagram, and wire accordingly. Avoid mounting the thermostat in the following locations:

1.Cold Areas - Outside walls or areas where drafts may affect the operation of the control.

2.Hot Areas - Areas where the sun's rays, radiation,

or warm air currents may affect the operation of the control.

3.Dead Areas - Areas where the air cannot circulate freely, such as behind doors or in corners.

THERMOSTAT HEAT ANTICIPATOR ADJUSTMENTS: The initial heat anticipator setpoint should equal the thermostat's current amperage draw when the unit is firing. This setpoint should be measured for the best results. Use the recommended ranges for a guide. If further information is needed, consult your thermostat manufacturer's instructions.

Recommended heat anticipator settings:

Unit Size:	30 thru 200	250 thru 400
For Tubular Units:	0.35 Amps	0.65 Amps

NOTICE: The start-up fan delay should not exceed 30 seconds from a cold start.

IMPORTANT: For all wiring connections, refer to the wiring diagram shipped with your unit (either affixed to the side jacket or enclosed in the installation instructions envelope). Should any original wire supplied with the heater have to be replaced, it must be replaced with wiring material having a temperature rating of at least 105° C.

Should any high limit wires have to be replaced, they must be replaced with wiring material having a temperature rating of 200° C minimum.

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